Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato)
International audience We have adapted an existing method to estimate coccolith calcite weight using birefringence (Beaufort, 2005) to suit the large coccoliths of Coccolithus pelagicus, which are only partially birefringent under cross-polarised light microscopy. Fossil and sediment trap material f...
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Online Access: | https://hal.archives-ouvertes.fr/hal-01458309 https://doi.org/10.1016/j.marmicro.2012.04.005 |
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ftccsdartic:oai:HAL:hal-01458309v1 2023-05-15T18:25:02+02:00 Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc Howard, William R. Hallegraeff, Gustaaf M. Paleobiology Program Uppsala University Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) 2012-09 https://hal.archives-ouvertes.fr/hal-01458309 https://doi.org/10.1016/j.marmicro.2012.04.005 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marmicro.2012.04.005 hal-01458309 https://hal.archives-ouvertes.fr/hal-01458309 doi:10.1016/j.marmicro.2012.04.005 ISSN: 0377-8398 Marine Micropaleontology https://hal.archives-ouvertes.fr/hal-01458309 Marine Micropaleontology, Elsevier, 2012, 92-93, pp.29-39. ⟨10.1016/j.marmicro.2012.04.005⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.1016/j.marmicro.2012.04.005 2021-10-24T09:02:59Z International audience We have adapted an existing method to estimate coccolith calcite weight using birefringence (Beaufort, 2005) to suit the large coccoliths of Coccolithus pelagicus, which are only partially birefringent under cross-polarised light microscopy. Fossil and sediment trap material from the South Tasman Rise region of the Southern Ocean was used for calibration and validation. Our approach was tested with only the coccolith central area (CA) considered for measurement, to avoid relying on the less robust proximal shields. Thus our results are relative and intend to quantify intra-specific variations in volumetric calcite weight, expressed as a Weight Index (WI). Our results were overall consistent with mass estimation based on distal shield lengths. However, the WI approach clearly has the advantage in exploring allometric scaling between coccolith size and weight, as well as in measuring the degree of calcification in similarly sized morphotypes. Combining WI and morphometry data (distal shield length, DSL), we demonstrate subtle, but statistically significant changes in shape and thus calcification degree both within and between the tested Coccolithus populations. Most strikingly, it appears that modern Coccolithus populations in the Southern Ocean are, on average, more heavily calcified than their fossil counterparts. (c) 2012 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) South Tasman Rise ENVELOPE(148.000,148.000,-47.500,-47.500) Southern Ocean Marine Micropaleontology 92-93 29 39 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc Howard, William R. Hallegraeff, Gustaaf M. Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We have adapted an existing method to estimate coccolith calcite weight using birefringence (Beaufort, 2005) to suit the large coccoliths of Coccolithus pelagicus, which are only partially birefringent under cross-polarised light microscopy. Fossil and sediment trap material from the South Tasman Rise region of the Southern Ocean was used for calibration and validation. Our approach was tested with only the coccolith central area (CA) considered for measurement, to avoid relying on the less robust proximal shields. Thus our results are relative and intend to quantify intra-specific variations in volumetric calcite weight, expressed as a Weight Index (WI). Our results were overall consistent with mass estimation based on distal shield lengths. However, the WI approach clearly has the advantage in exploring allometric scaling between coccolith size and weight, as well as in measuring the degree of calcification in similarly sized morphotypes. Combining WI and morphometry data (distal shield length, DSL), we demonstrate subtle, but statistically significant changes in shape and thus calcification degree both within and between the tested Coccolithus populations. Most strikingly, it appears that modern Coccolithus populations in the Southern Ocean are, on average, more heavily calcified than their fossil counterparts. (c) 2012 Elsevier B.V. All rights reserved. |
author2 |
Paleobiology Program Uppsala University Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) |
format |
Article in Journal/Newspaper |
author |
Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc Howard, William R. Hallegraeff, Gustaaf M. |
author_facet |
Cubillos, Joana C. Henderiks, Jorijntje Beaufort, Luc Howard, William R. Hallegraeff, Gustaaf M. |
author_sort |
Cubillos, Joana C. |
title |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_short |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_full |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_fullStr |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_full_unstemmed |
Reconstructing calcification in ancient coccolithophores: Individual coccolith weight and morphology of Coccolithus pelagicus (sensu lato) |
title_sort |
reconstructing calcification in ancient coccolithophores: individual coccolith weight and morphology of coccolithus pelagicus (sensu lato) |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.archives-ouvertes.fr/hal-01458309 https://doi.org/10.1016/j.marmicro.2012.04.005 |
long_lat |
ENVELOPE(148.000,148.000,-47.500,-47.500) |
geographic |
South Tasman Rise Southern Ocean |
geographic_facet |
South Tasman Rise Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0377-8398 Marine Micropaleontology https://hal.archives-ouvertes.fr/hal-01458309 Marine Micropaleontology, Elsevier, 2012, 92-93, pp.29-39. ⟨10.1016/j.marmicro.2012.04.005⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marmicro.2012.04.005 hal-01458309 https://hal.archives-ouvertes.fr/hal-01458309 doi:10.1016/j.marmicro.2012.04.005 |
op_doi |
https://doi.org/10.1016/j.marmicro.2012.04.005 |
container_title |
Marine Micropaleontology |
container_volume |
92-93 |
container_start_page |
29 |
op_container_end_page |
39 |
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1766206177336623104 |